Just started this recently, though I’ve been thinking about it for awhile. The design relies on the user controlling the car mostly through gestures, with a HUD displayed using transparent OLEDs on the windshield, and a keypad for alphanumeric entry.
I have chosen this design path to minimize the time that the driver spends looking down/away from the road - the entire control mechanism of the car should be up in front of them, to maximize safety and control. The use of a physical keypad instead of a touchscreen enhances safety - users can feel the physical keys, and thus with practice do not have to look down and away from the road to type; unlike with touchscreens, where the lack of tactile feedback precludes one’s ability to instinctively sense which keys they are pressing.
Still a WIP and I have to do the interface - so little time, so much to do! Thanks Visteon/CGSociety for the cool contest!